Skiving machine



L'ZZLSG 'July 1.6, 1929.

A. R. RIDERTRM SKIVING MACHINE Filed Oct, l5, 1923 Patented July 16,1929.

UNITED STATES `P l-i'lfEll'l' OFFICE.

ANDREW R. RIDDERSTROM, OF NAHANT, MASSACHUSETTS, ASSIGNOR, BY MESNEASSIGNMENTS, T0 UNITED SHOE MACHINERY CGRPORATION, OF PATERSON, NEWJERSEY, A CORPORATION OF NEW JERSEY.

SKIVING MACHINE.

Application filed October 13, 1923.

The present invention relates to skiving machines, and more particularlyto machines such as are used in shoe factories to skive the margins ofshoe uppers.

The chief object of theinvention is to provide an improved presser footand gage. Other objects will appear from the following description,taken in connection with the accompanying drawings, and will beparticularly pointed out in the appended claims, it

being undeistood that it is intended to set forthV in the claims all thenovelty that the invention may possess.

With these objects inview, the invention consists of the machinehereinafter described, illustrated in the accompanying drawings, anddefined in the appended claims.

In the accompanying drawings, Fig. 1 is a perspectiveview of the forwardportion of a skiving machine, illustrating a preferred embodiment of thepresent invention; Figs. 2 and 3 are fragmentary side and rearelevations of the same; Fig. 4 is a front elevation of a modification;Fig. 5 is a front elevation of a portion of the machine shown in Fig. 4,with a part broken away; and Fig. 6 is a view corresponding to Fig. 2 ofthe modification shown in Fig. 4.

The preferred embodiment of the present invention is illustrated finFigs. 1, 2 and 3 as applied to a machine that is more fully illustratedand described in a copending application, Serial No. 521,239, filedkDecember 9, 1921. yThe machine illustrated in the modification .ofFigs. 4, 5 and 6 constitutes the subject matter of avcopendingapplication, Serial No. 319,565, filed August 25, 1919,- of which thepresent application is a continuation in part. It is not necessary todescribe either of these machinesin detail, inorder to obtain anunderstandingof the present invention,`as the invention is equally'applicable toother machines of well known type, but reference isniade tothe above-named applications for a fuller description of such portionsof the machines as it is considered to be unnecessary to illustrate anddescribe herein.

In skiving machines of the above-designated character, the shoe upper isusually advanced by a feed roll 95 and a feed disk 143 to a rotatingskiving knife 185 that cuts a scarf in the margin of the material. e TheSerial No. 668,346.

feed roll 95 is provided with a frusto-conical working face 127 and isshown mounted uponk a feed roll shaft 33 journaled in a sub-frame 36that is housed in a base portionv21 of the frame of the machine. Thefeed disk is mounted at the lower end of a feed-disk shaft 137 that,together with the knife shaft 181, is

feed roll 95 and the feed disk 143, properly to guide the work and holdit in place. The gage limits the extent of the scarf, so that themargins of various uppers shall be skived uniformly, and. the presserfoot presses the leather or other stock yieldingly against the feedroll95. According to the present inL vention, the presser foot 131 yieldsboth vertically and pivotally to accommodate itself to variations in thethickness of the leather, but in the illustrated, normal position, itswork-engaging face is parallel to, or in contact with, the adjacentwork-engaging face 127 of the feed roll 95.

The novel presser footofthe present invention is carried at the free,outer end of a leaf spring arm 125. rlhe said free outer end of thespring arm is resiliently movable vtowards and from the feed roll. Thespring arm 125, and also the gage 132, are mounted upon a holder orblock 119 that is adjustably secured to the sub-frame 86 in any desiredmanner, as by means of one or more set screws 118 that extend throughone or more elongated openings 120 in the block 119 and are tapped inthe sub-frame, to one side thereof. The holder or block shownin themodification of Figs. 4, 5 and 6 is T-sliaped, except for a very shortportion at 122, where it is cut away to allow for freedom in adjustinggages of various shapes. The elongated openings 120 .iay provide eitherfor horizontal adjustment, as shown in Fig. 1, or vertical adjustment,as illustrated in Fig. 4, or both. The spring arm 125 is adjustablysecured to the block 119 in any convenient manner, as by means of one ormore screws 123. Viewed from the side, as in Figs. 2 and 6, the springarm 125 is seen at an incline, and is provided with two depending ears128.

A feature of the present invention resides in having the presser foot131 yieldingly mounted on the out-er end of the spring arm 125.According to the embodiment of the invention that is illustrated inFigs. 4 to 6, a lug 130 of the presser foot 131 is interina diatelypivoted betwen the ears 128 at 129. The ears 128 serve as a guide forthe presser foot during` its pivotal movement, to prevent tilting of thepresser foot about an axis parallel to the axis of rotation of the feedroll and to keep the presser foot upright. Tivo coil springs 133 areprovided, one acting on each side of the pivotal point 129, so asyieldingly to oppose movement of the presser foot in either directionfrom the illustrated, normal position, in which its Work-engaging faceis parallel to, or in contact With, the adjacent Worlnengaging face 127of the feed roll 95. Owing to this construction, the presser foot may beemployed With feed rolls having, differently inclined Work faces 127,across which the presser foot may be adjusted so as to occupy anydesired position thereon.

The presser foot is thus yieldinp'ly carried at the free end of thesi'irinp; arm 125. and its oscillations, in either direction, areyieldingly opposed by the springs 133. The gage 132 rests against theworking` face 127 of the feed roll 95, and is curved to conform to thesame. In the preferred construction. the `rage 132 is removably securedto the block 119, as by a screw 84. In the modification of Figs. 4, 5and 6, the gage 132 is integrally connected to the spring arm 125. Theconstruct-ion permits positioning the gage and the presser foot close tothe knife 185; and as the presser foot yields both vertically andpivotally, it automaticallyY adjusts itself to variations in thethickness of the stock. The scarf Will commence and terminate very closeto the presser foot.

In the modifications of Fins. Ll, 5 and 6, the springs 133 areinterposed between the presser foot 131 and the spring?Y arm 125, one oneach side of the lug` 130. In the preferred embodiment of the invention,however, the springs 133 are mounted over screw-threaded rods 56 thatextend loosely through openings 58 in a plate member 8O that is rigidlysecured to the spring arm 125 so as, in effect, to become a partthereof, and that carries the ears 128. The springs are confined betweenthe plate member and nuts 90. The rods 56 are threaded into the presser'foot 131 so as to move rigidly therewith. The pivotal point 129 of thispreferred embodiment is constituted of a J -shaped recess, provided uponthe presser foot 131, as shown in Fig. 3, and the lun' 130 isconstituted of a Wedge-shaped pivotal projection provided upon thesupport and that pivots in the V-shaped recess. This constructionendoivs the presser foot With a very firm holding;` action, yet rendersit very sensitive, so as to yield readily, Where re quired. It wouldspoil the effect if the springarm 125 were too flexible. To reduce theflexibility, therefore, a spring 60 is coiled about a screw-threaded rod62, that extends through the plate member 8() and the spring arm 125,and thatY is screw-threaded into the block 119. The coil spring 60 ismaintained between the plate member 8O and a nut 92. The combined actionof the springs 125 and 60 is to render the yielding action of thepresser foot somewhat stiff. In order that the presser foot 131, somounted, shall not press too heavily against the Work, a stop 94 that ismounted upon the spring arm 125 is adapted to engage the block 119,thereby to limit the movement of the presser foot 131 towards the feedroll 95. The stop is in the form of a set screw, rendering' it possibleto y adjust the stop for Work of different thickof the invention, asdefined in the appended claims.

What is claimed is:

1. In a machine of the character described, al feed roll, a revolubleknife, a block, a member a. portion of Which is rigidly fastened to theblock, a presser foot freely svvivelled intermediate its ends to anotherportion of the member and adapted to cooperate With the feed roll andwith the knife, and equalizing means acting' yieldingly upon the presserfoot and tending to maintain the presser foot yieldingly in apredetermined position.

2.V In a machine of the character described, a revoluble knife, a feedroll, a presser foot cooperating with the knife and with the feed roll,means for mounting the presser foot in termediate its ends, springmeansactingr upon the presser foot upon both sides of its pivotal point, andadjustable yielding means sup port-ing` the presser foot.

3. In a machine of the character described, a revoluble knife, a feedroll, a block, a member a portion of which is rigidly'fastened to theblock, a presser foot mounted upon another portion of the member tocooperate With the knife and with the feed roll, means for adjusting thesaid other portion of the member tovvards and from the feed roll, thepresser foot being pivotally mounted upon the said other portion of themember intermediate of its ends, and equalizing means normally adaptedto yieldingly maintain the presser foot in a position substantiallyparallel to the adjacent surface of the feed roll.

4. In a machine of the character described, an angularly turned springprovided with ears, a presser foot pivoted between the ears andequalizing means acting yieldingly upon the presser foot and tending tomaintain the presser foot yieldingly in a predetermined position.

5. In a machine of the character described, a feed roll, an angularlyturned spring eX- tending over the feed roll in a directionsubstantially parallel to the axis of the feed roll and provided withears and a gage that eX- tends along a portion of the periphery7 of theroll and is curved to conform to the same, a presser foot pivotedbetween the ears, and springs between the angularly turned spring andthe presser foot.

6. A skiving machine having, in comb-ina tion, a knife, a feed roll, anintermediately pivoted presser foot, and spring means acting upon thepresser foot upon both sides of its pivotal point.

7. A skiving machine having, in combination, a. knife, a feed roll, ablock, a leaf spring fastened to the block in such manner that its outerend is movable towards and from the roll, a presser foot intermediatelypivoted to the outer end of the leaf spring, and spring means actingupon the presser foot upon both sides of its pivotal point.

8. A presser foot comprising a leaf spring, a presser footintermediately pivoted to an end of the leaf spring, and spring meansacting upon the presser foot upon both sides of the pivotal point.

9. A skiving machine having, in combination, a knife, a feed roll, ablock, a leaf spring fastened to the block in such a manner that itsouter end is movable toward and from the roll, a presser foot carried bythe outer end of the leaf spring and movable relatively thereto, andspring' means located between the foot and the leaf spring.

10. A skiving machine having, in combination, a knife, a feed roll, aleaf spring fastened to a stationary part of the machine in such mannerthat its outer end is movable from and towards the roll, a presser footcarried by the outer end of the leaf spring, and a spring locatedbetween the inner end of the foot and theleaf spring.

11. A skiving machine having, in combination, a knife, a feed roll, aspring arm fastened to a stationary part of the machine in such mannerthat its outer end is movable towards and from the roll, and a presserfoot yieldingly mounted on the spring arm.

outer end of the 12. A skiving machine having, in combination, a knife,a feed roll, a support, a presser foot yieldingly mounted upon thesupport, means for guiding the presser foot in its yielding movement,and equalizing means disposed between the presser foot and the supportand tending to maintain the presser foot yieldingly in a predeterminedposition.

13. A skiving machine having, in combination, a knife, a feed roll, aspring arm fastened to a stationary part of the machine in such mannerthat its outer end is movable towards and from the roll, a presser footcarried by the outer end. of the spring arm and movable relativelythereto, and spring means yieldingly connecting the presser foot to thespring arm.

14s. A skiving machine having, in combination, a knife, a feed roll, astationary member, a leaf spring mounted on the stationary member insuch manner that its outer end is yieldable toward and from the roll, apresser foot carried by the outer end of theleaf spring, means foryieldingly opposing movement of the foot, and means constructed andarranged to prevent tilting of the presser foot about an axis parallelto the axis of rotation of the roll.

15. A skiving machine having, in combination, a knife, a feed roll, aspring arm fastened to a stationary part of the machine in such mannerthat its outer end is movable towards and away from the roll, a presserfoot intermediately pivoted to the outer end of the spring arm, two rodssecured to the presser foot, one on each side of the pivot, and a springmounted on each rod.

16. A skiving machine having, in combination, a knife, a feed roll, apresser foot having a V-shaped recess, a support having a wedgeshapedprojection pivotally disposed in the recess, and means yieldinglymaintaining the wedge-shaped projection in the recess.

17. A skiving machine having, in combination, a knife, a feed roll, aleaf spring fastened to a stationary part of the machine in such mannerthat its outer end is movable towards and from the roll, a presser footintermediately pivoted to the outer end of the leaf spring and having arecess, a member having a projection mounted in the recess, and springmeans acting upon the presser foot upon both sides of its pivotal point.

18. A skiving machine having, in combination, a knife, a feed roll, andtwo members one of which comprises a presser foot having a recess andthe other a support having a projection mounted in the recess, theconstruction and arrangement being such that the presser foot is freelypivotable about the` projection as a pivot, the recess being opensidedto permit bodily separation of the members by a bodily movement of onemember away from the other member in a direction at right angles to thepivotal axis.

In testimony whereof, l have hereunto subscribed my name this 11th dayof October, 1928.

ANDREW R. ninnnns'rnon.

CERTIFICATE 0F CORRECTION.

Patent No. 1,721, 050. Granted July 16, 1929, to

ANDREW R. RIDDERSTROM.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 3,after line 123, insert the following as claim 19:

19. A skiving machine having, in combination, a knife, a feed roll, andtwo members, one of which comprises a presser foot that is freelymovable upon the other member, one of the members having a recess andthe other a projection movably disposed in the recess, whereby thepresser foot is freely movable upon the other member about theprojection, and the recess being opensided to permit bodily separationof the members by a sidewise movement of one of the members away fromthe other member.;

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in thePatent Office.

Signed and sealed this 13th day of January, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents.

